通过MATLAB实现对无排队等待的呼叫系统的仿真，并且得出在不同的呼叫到达速率下系统的阻塞率，并且和理论的erlangB公式做出对比。-MATLAB to achieve through the call without waiting in line system simulation, and come to a different call arrival rate in the system blocking rate, and the formulas and theories erl